drivers/isdn/i4l/* - compile warning

diff -Nurdp -X dontdiff-osdl linux-2.6.11-rc3-mm2-original/drivers/isdn/i4l/isdn_common.c linux-2.6.11-rc3-mm2/drivers/isdn/i4l/isdn_common.c
@@ -1842,8 +1842,12 @@ isdn_writebuf_stub(int drvidx, int chan,
 	if (!skb)
 		return 0;
 	skb_reserve(skb, hl);
-	copy_from_user(skb_put(skb, len), buf, len);
+	if (copy_from_user(skb_put(skb, len), buf, len)) {
+		ret = -EFAULT;
+		goto after_writebuf_skb;
+	}
 	ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, 1, skb);
+after_writebuf_skb:
 	if (ret <= 0)
 		dev_kfree_skb(skb);
 	if (ret > 0)

diff -Nurdp -X dontdiff-osdl linux-2.6.11-rc3-mm2-original/drivers/isdn/i4l/isdn_ppp.c linux-2.6.11-rc3-mm2/drivers/isdn/i4l/isdn_ppp.c
@@ -789,7 +789,8 @@ isdn_ppp_read(int min, struct file *file
 	is->first = b;
 
 	spin_unlock_irqrestore(&is->buflock, flags);
-	copy_to_user(buf, save_buf, count);
+	if (copy_to_user(buf, save_buf, count))
+		count = -EFAULT; /* make sure we free the save_buf */
 	kfree(save_buf);
 
 	return count;

diff -Nurdp -X dontdiff-osdl linux-2.6.11-rc3-mm2-original/drivers/isdn/i4l/isdn_v110.c linux-2.6.11-rc3-mm2/drivers/isdn/i4l/isdn_v110.c
@@ -520,7 +520,7 @@ isdn_v110_stat_callback(int idx, isdn_ct
 {
 	isdn_v110_stream *v = NULL;
 	int i;
-	int ret;
+	int ret = 0;
 
 	if (idx < 0)
 		return 0;